module.exports = {
  plugins: {
    autoprefixer: {},
  },
}


class Obj{
  constructor(){
    this.a = 1
    this.fn = ()=>{
      console.log(this.a)
    }
  }
}

let obj = new Obj()
obj.fn()

class Obj2{
  constructor(){
    this.a = 4
  }
}

let obj2 = new Obj2()
obj2.fn=obj.fn
obj2.fn()